Not to be a naysayer here,as this wasn't the question but I would protect the antennas by returning the cover...
I've seen this discussion in several different forums and I'm of the persuasion that a good coat of wax protects the coach just fine...
Covers have the tendency to flap in the wind and actually move on the coach,which in my opinion has greater potential to do more harm to the paint than good...
Yes,I've had a cover before....I used one on a fifth wheel that I bungied in every configuration you could imagine and thus I've seen the pros and cons firsthand...
To each his own, I don't cover my coach.